Method of making stereotype-matrices



C. WINKLER. METHOD-0F MAKING STEREOTYPE MATRICES.

APPLICATION FILED JAN-4'. m7.

1,333,336 1 Patented Mar. 9, 1920.

By I O CARL WINKLER, 'OF BERNIE, SWITZERLAND.

METHOD OF MAKING STEREO'IYPE-MATRICES.

To all whom it may concern:

Be it known that I, CARL WINKLER, a

' citizen of the Swiss Republic, resident 'at i Yhas'thedrawback that the type,

: ing out my invention which is illustrated,

Berne, in ithe Swiss Republic, have invented an, Improved Method for Making StereotypeMatrices, of which the following is a specificatiom A Thisjfinvention relates to an improved 5 [method ior making stereotype matrices. L

Heretofore it was usual, in making stereo'- type matrices in a press, to dry said matrices under the high pressure at which they are' .imprinted. For this purpose the driving motor of the press was put out of gear or stopped when the press head had reached its lowest position. This method, however,

is injured by the united action of the pressure and heat.

In my patent application No. 41120 of 1915 I have described a mechanical matrix-, imprinting press, in which reduced pressure is brou ht to bear upon the matrix, by a special fieviceq'ust after the maximum pressure has ceased to act on the matrix.

It will be understood, that the mentioned method can be used withoutprovidingthe imprinting press with automatically actioned devices for this-purpose.

According to my present inventionthe before mentioned drawback is overcome by imprinting the matrix, as heretofore, at a high pressure, and by then drying said matrix at a reduced pressure. In other words, the press is not stopped for drying the matrix until the press-head, or the like, has passed, or retreated from, the oint of highest pressure, that is, this will on y be the case if the press is turned 011 at high pressure, turned on again after a little while and turned ofi' when the pressure is less. Thus the pressure on the matrices is released or reduced just after maximum pressure.

In the accompanying drawings in which a pres'sadapted to carry out my invention is shown by way of example, Figure 1 is a side elevation of the press,

and p Fig. 2 is a top plan view of the same with the work table removed. I

The embodiment of mechanism for carrycomprises an electric motor a which drives the worms through the clutch b. ThlS worm Specification of Letters Patent.

Application,fi1ed January 4, 1917.

or the like,

Patented Mar. 9, 1920. Serial No. 140,602. I

engages a worm-wheel d, the rotation of which is imparted through the spur-wheels e, f and g, to the crank-wheel h. The crankwheel through the agency of the connecting rod 6, moves the toggle la and thus alternately raises and lowers the press head I.

' t On the shaft m'of the crank-wheel h is fastened a cam 01., which twice in every revolution, operates a detent lever 0 torelease the lever 1), the consequent movement of which disengages the clutch b, thereby stopping the vertical movement of the press ead. I

The protuberances upon the cam n which operate the lever o are so positioned as to cause one. protuberance to operate said lever and thereby 'stop' the press just after the maximum pressure has been exerted by the press head, or in other words to stop the press in such a position as to exert a slightly less than maximum pressure upon the matrix; and to cause the other protuberance to operate lever o and stop the press when the press head has reached its highest position.

By this arrangement it will be seen that the press is stopped after the maximum pressure has been exerted to form a matrix, and the matrix is allowed to dry while subjected to this somewhat-less than maximum pressure; and when'it is desired to remove the matrix the press isstopped at its other stop position, that is, at itsh-ighest point of movement.

A matrix is thus adapted to be formed .by exerting maximum-pressure to imprint I CARL WINKLER.

Witnesses:

A. KURBACH, CHAS. WARD BLUNDI. 

